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   <a href="drvsim_active_extensions.htm">VI-Active Technology</a>&nbsp;&gt;</p>
      <h1 class="p_Heading1" style="page-break-after: avoid;"><span class="f_Heading1">Active Seat</span></h1>

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<p class="p_Normal">The Active Seat is a pneumatic system that makes it possible to feel constant accelerations while driving the simulator. Driving on the DiM, high frequencies accelerations are transmitted to the driver by moving the platform; low frequencies acceleration (such as lateral acceleration during long corners) cannot be recreated with a movement of the platform, because of space constraints. </p>
<p class="p_Normal">The use of the Active Seat can help to reproduce the sensations of low frequencies accelerations felt by the driver in a real car. During these kind of accelerations, the Active Seat increase the contact pressure between the seat and the driver where needed: this gives the driver the sensation of acceleration, helping to understand the vehicle conditions and reducing the motion sickness.</p>
<p class="p_Normal">The VI-ActiveSeat consists of eight air bladders in specific locations which are inflated proportionally to the vehicle accelerations.</p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal" style="text-align: center;"><img alt="drvsim_as_cushions" width="960" height="388" style="margin:0px auto 0px auto;width:960px;height:388px;border:none" src="drvsim_as_cushions.png"/></p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal">The logic behind the VI-ActiveSeat calculates the pressure inside each air bladder using the VI-CarRealTime channels of vehicle accelerations and several tunable parameters. By modifying these parameters, it is possible to tune the feeling depending on the driver, car and seat.</p>
<p class="p_Normal">Parameters and their meaning are fully explained in <a href="drvsim_active_seat_configuration.htm" class="topiclink">Active Seat Configuration</a> sub-chapter.</p>
<p class="p_Normal">The pressure within the lateral air bladders (number 1-2-5-6) is dependent on lateral acceleration; i.e. during a left corner (negative lateral acceleration) the right lateral cushions are inflated, while left lateral cushions are deflated. The image below shows the pressure inside each lateral air bladders and the vehicle lateral acceleration during a left corner.</p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal" style="text-align: center;"><img alt="drvsim_as_plot_lateral_cushions" width="1000" height="398" style="margin:0px auto 0px auto;width:1000px;height:398px;border:none" src="drvsim_as_plot_lateral_cushions.png"/></p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal">Rear and bottom air bladders have asymmetric behaviour: this means that pressure is dependent on both longitudinal and lateral accelerations (for rear air bladders – number 3-4) and vertical and lateral accelerations (for bottom air bladders – number 7-8). E.g. If a negative lateral acceleration and a positive longitudinal acceleration is present (see image below), the pressure inside the two rear air bladders will be redistributed; the pressure inside the rear right air bladder will be greater than the pressure inside the rear left air bladder.</p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal" style="text-align: center;"><img alt="drvsim_as_rear_cushions_crc" width="975" height="452" style="margin:0px auto 0px auto;width:975px;height:452px;border:none" src="drvsim_as_rear_cushions_crc.png"/></p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal">The same happens in case of combined vertical and lateral accelerations for the bottom air bladders. When a positive vertical acceleration is present, the bottom air bladders are inflated proportionally; then, if a lateral acceleration is present, the pressure inside the two air bladders is redistributed, as shown in the image below.</p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal" style="text-align: center;"><img alt="drvsim_as_plot_bottom_cushions" width="975" height="425" style="margin:0px auto 0px auto;width:975px;height:425px;border:none" src="drvsim_as_plot_bottom_cushions.png"/></p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal">If no lateral acceleration is present, the pressure will be the same for both air bladders: the picture below shows the pressure trend inside rear air bladders during a straight acceleration.</p>
<p class="p_Normal">&nbsp;</p>
<p class="p_Normal" style="text-align: center;"><img alt="drvsim_as_rear_cushions_straight_Acc" width="970" height="452" style="margin:0px auto 0px auto;width:970px;height:452px;border:none" src="drvsim_as_rear_cushions_straight_acc.png"/></p>

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